Flashcards in histo lec - glands Deck (16):
1
Originate from an epithelium that penetrates C.T and forms secretory units
glands
2
protein in aqueous solution: hormones, acids, oils.
Secretion
3
Consists of a functional portion (parenchyma) of secretory and ductal epithelial cells, which is separated by a basal lamina from supporting connective tissue elements (Stroma)
glands
4
Classification based on the site of secretion:
exocrine
endocrine
paracrine
5
Classification based on the site of secretion
No duct, release secretion into blood vessels
Products are called hormones
Thyroid, adrenal and pituitary glands
endocrine
6
Classification based on the site of secretion
Contain ducts, empty onto epithelial surface
Sweat glands, Oil glands, Salivary glands, Mammary glands
Exocrine glands
7
Classification based on the site of secretion
secrete into the local extracellular space
Paracrine glands
8
type of Exocrine glands
unicellular
multicellular
9
glands composed of single cell (goblet cell)
unicellular
10
Multicellular glands secrete the following substances:
– a viscous material that usually protects or lubricates cell surfaces (e.g. goblet cells, salivary glands, surface cells of stomach).
Mucus
11
Multicellular glands secrete the following substances
- contain both mucous and serous components
Mixed secretions
12
Multicellular glands secrete the following substances:
– are watery and often rich in enzymes (e.g parotid gland and pancreas)
serous
13
Mechanisms of Secretion
merocrine, holocrine, apocrine
14
Just released by exocytosis without altering the gland at all.
Ex: Sweat glands and salivary glands
Merocrine
15
The gland ruptures and releases secretion and dead cells as well.
Disintegration of cells
Sebaceous (oil glands on the face) only example
Holocrine
16